Graph Search Query by SiteId

Question

I am trying to do a graph search query that bring the last 20 items updated from a specific site ordered by the lastModifiedDateTime, and if possible also filtered by a custom field that they should have.

this is the query i have

POST https://graph.microsoft.com/v1.0/search/query
    {
        "Requests": [
            {
                "entityTypes": [
                    "listItem"
                ],
                "query": {
                    "queryString": "isDocument:true AND siteId:<site-id> "
                }
            }
        ]
    }

in this example the when i try to add the siteid the query breaks and brings no result